David Worsham 919f8e6a42 Move fuchsia/scenic integration behind #define (flutter/engine#19003)
Additionally create "_next" permutations for all of the test binaries
on Fuchsia, in order to test both code-paths.

Using the #define follow-up CLs can also create a flutter_runner_next
binary that does not contain any legacy integration code.

BUG: 53847
2020-06-26 14:03:18 -07:00
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